Pius XI and Guglielmo Marconi inaugurate Vatican Radio (12 February 1931)
In 1933, Vatican Radio was to broadcast the opening ceremony for the Holy Door during the Holy Year of the Redemption
Felici (papal photogr.), Il Santo Padre e G. Marconi inaugurano la stazione della Radio della città vaticana, in: Guido Guida, Pio XI, Milano 1938